Heterogeneous Photonic Circuits With Integrated Optical Pumping
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Solution Overview
Problem
The use of fiber-based laser modules to pump photonic integrated circuits increases system size and complexity due to coupling between optical fibers and integrated optical waveguides, which are not efficiently integrated onto a substrate.
Innovation Solution
The development of heterogeneous photonic circuits that integrate a gain section and a photonics section, where the gain section includes a gain waveguide and the photonics section includes optical waveguides, output couplers, and light-generating photonic circuits, allowing for tunable optical characteristics through feedback mechanisms.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Use of energy by moving object
If fiber-based laser modules are used to pump photonic integrated circuits, then optical pumping function is achieved, but system size increases
Solution Approach 1:
The patent merges the gain section and photonics section onto a single substrate to form an integrated pump module. This combining of previously separate components (fiber-based laser module and photonic integrated circuit) into a unified structure reduces overall system size while maintaining the optical pumping function. The gain waveguide and optical waveguides are integrated on the same substrate, eliminating the need for external fiber coupling.
Solution Approach 2:
The integrated pump module is segmented into distinct functional sections: a gain section with gain waveguide for light amplification, and a photonics section with optical waveguides for light guidance. This segmentation allows each component to be optimized for its specific function while being integrated on a common substrate, achieving compact size without sacrificing performance.
2Use of energy by moving object
If fiber-based laser modules are used to pump photonic integrated circuits, then optical pumping function is achieved, but system complexity increases
Solution Approach 1:
By integrating the gain section and photonics section on a single substrate, the patent eliminates the complexity associated with coupling external fiber-based laser modules to photonic integrated circuits. The merged structure removes the need for separate fiber alignment and coupling mechanisms, significantly reducing system complexity while maintaining optical pumping functionality.
3Quantity of substance
If optical fibers and integrated optical waveguides are coupled, then light transmission is achieved, but coupling efficiency is poor
Solution Approach 1:
The patent merges the gain waveguide and optical waveguides onto the same substrate with direct optical coupling. This integration eliminates the interface between separate fiber and waveguide systems, achieving high coupling efficiency through monolithic fabrication. The light transmission is maintained while the coupling efficiency is dramatically improved by removing the fiber-to-waveguide coupling interface.
4Volume of moving object
If heterogeneous photonic circuits integrate gain section and photonics section, then system size is reduced, but manufacturing complexity increases
Solution Approach 1:
The heterogeneous photonic circuit is segmented into distinct gain section and photonics section, each with specific functions. This segmentation allows for specialized fabrication processes for each section while maintaining overall integration on a single substrate. The modular segmentation simplifies the manufacturing complexity by allowing independent optimization and fabrication of each section before integration.
Solution Approach 2:
The patent employs parameter changes in the fabrication process to accommodate different material systems and optical characteristics in the gain section versus the photonics section. By adjusting fabrication parameters such as deposition conditions, etching parameters, and material compositions, the patent achieves successful integration of heterogeneous sections on a single substrate, managing manufacturing complexity through parameter optimization.
Applied Scientific Principles
This section explains which scientific principles are used to turn an abstract innovation direction into a practical engineering solution.
Function Achieved in This Case
This approach reduces system size and complexity by enabling efficient integration and tunable optical performance, improving the functionality of photonic integrated circuits.
Implementation Method 1
a gain waveguide, integrated with the gain section, to amplify light by stimulated emission in a laser cavity
Implementation Method 2
an output coupler, integrated with the photonics section and in optical communication with the optical waveguide to partially form the laser cavity of an integrated pump module, the output coupler configured to transmit the light amplified by stimulated emission from the laser cavity as a pump beam
Implementation Method 3
a light-generating photonic circuit, integrated with the photonics section and in optical communication with the laser cavity. The light-generating photonic circuit can be configured to: receive the pump beam from the laser cavity, and output a signal beam at a signal wavelength different than the pump wavelength in response to optical pumping
Data Source
AI summary
Heterogeneous photonic circuits comprise a gain section optically coupled to a photonics section. The gain section can include at least one gain waveguide which can be formed from a III-V semiconductor material to provide optical gain. The gain waveguide can be coupled to optical components in the photonics section to form an integrated pump module. The photonics section can include a light-generating photonic circuit, which can comprise at least one waveguide doped with a rare-earth ion or transition-metal ion. Output from the integrated pump module and/or the light-generating photonic circuit can be tunable. Tuning can be implemented with feedback control.